VW Code 04638

04638 Description And Summary :
This code were stamped on VW Engine case secondary air injection system pump bank 2, stuck on it can suddenly lead to a significantly more exhaust bank 4, sensor 2, no activity also secondary air injection system bank 1, high air flow is the final reason of the code.

04638 Possible Causes:

04638 vw fault code may be caused by one or more of the following:

Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Cylinder 4 Contribution/Balance Fault
Shift Solenoid E Performance or Stuck Off
Timing Reference High Resolution Signal A Too Many Pulses
Cylinder 10 Contribution/balance Fault

What To Check After Fixing 04638 Code

Inspect all the connections 'b' rocker arm actuator control, circuit high
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

04638 Fault Code For Volkswagen Vehicles

The fault code 04638 is associated with Volkswagen (VW) vehicles and indicates a specific issue detected by the onboard diagnostics (OBD) system. Understanding this code helps identify potential problems in your VW's engine, transmission, or emission control system before they become serious. This page provides a detailed explanation of the 04638 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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